<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>qmcdump</title>
</head>

<body>
  <p>qmc3,qmcflac,qmcogg,qmc0</p>
  <input type="file" name="" id="openFile" accept=".QMCFLAC,.QMC0,.QMC3">
  <script>
    let openFile = document.querySelector('#openFile')
    openFile.addEventListener('change', e => {
      let QMC = new Blob(openFile.files)
      let reader = new FileReader()
      reader.readAsBinaryString(QMC)
      reader.onload = e => {
        let result = e.target.result
        let length = e.target.result.length
        let bstr = new Uint8Array(length)
        for (let i = 0; i < length; i++) {
          bstr[i] = result[i].charCodeAt(0) ^ mapL(i);
        }
        let file = new Blob([bstr])
        let element = document.createElement("a")
        let name = openFile.files[0].name.replace("qmc3", "mp3").replace("qmcflac", "flac").replace("qmcogg", "ogg").replace("qmc0", "mp3")
        element.innerText = name
        element.download = name
        element.href = window.URL.createObjectURL(file)
        document.body.appendChild(element)
      }
    })
    //https://github.com/MegrezZhu/qmcdump/blob/master/src/crypt.cpp
    function mapL(i) {
      if (i >= 0x8000) {
        return getI(i % 0x7fff);
      } else {
        return getI(i);
      }
    }
    function getI(i) {
      var maps = [0x77, 0x48, 0x32, 0x73, 0xDE, 0xF2, 0xC0, 0xC8, 0x95, 0xEC, 0x30, 0xB2, 0x51, 0xC3, 0xE1, 0xA0,
        0x9E, 0xE6, 0x9D, 0xCF, 0xFA, 0x7F, 0x14, 0xD1, 0xCE, 0xB8, 0xDC, 0xC3, 0x4A, 0x67, 0x93, 0xD6,
        0x28, 0xC2, 0x91, 0x70, 0xCA, 0x8D, 0xA2, 0xA4, 0xF0, 8, 0x61, 0x90, 0x7E, 0x6F, 0xA2, 0xE0, 0xEB,
        0xAE, 0x3E, 0xB6, 0x67, 0xC7, 0x92, 0xF4, 0x91, 0xB5, 0xF6, 0x6C, 0x5E, 0x84, 0x40, 0xF7, 0xF3,
        0x1B, 2, 0x7F, 0xD5, 0xAB, 0x41, 0x89, 0x28, 0xF4, 0x25, 0xCC, 0x52, 0x11, 0xAD, 0x43, 0x68, 0xA6,
        0x41, 0x8B, 0x84, 0xB5, 0xFF, 0x2C, 0x92, 0x4A, 0x26, 0xD8, 0x47, 0x6A, 0x7C, 0x95, 0x61, 0xCC,
        0xE6, 0xCB, 0xBB, 0x3F, 0x47, 0x58, 0x89, 0x75, 0xC3, 0x75, 0xA1, 0xD9, 0xAF, 0xCC, 8, 0x73, 0x17,
        0xDC, 0xAA, 0x9A, 0xA2, 0x16, 0x41, 0xD8, 0xA2, 6, 0xC6, 0x8B, 0xFC, 0x66, 0x34, 0x9F, 0xCF, 0x18,
        0x23, 0xA0, 0xA, 0x74, 0xE7, 0x2B, 0x27, 0x70, 0x92, 0xE9, 0xAF, 0x37, 0xE6, 0x8C, 0xA7, 0xBC, 0x62,
        0x65, 0x9C, 0xC2, 8, 0xC9, 0x88, 0xB3, 0xF3, 0x43, 0xAC, 0x74, 0x2C, 0xF, 0xD4, 0xAF, 0xA1, 0xC3, 1,
        0x64, 0x95, 0x4E, 0x48, 0x9F, 0xF4, 0x35, 0x78, 0x95, 0x7A, 0x39, 0xD6, 0x6A, 0xA0, 0x6D, 0x40,
        0xE8, 0x4F, 0xA8, 0xEF, 0x11, 0x1D, 0xF3, 0x1B, 0x3F, 0x3F, 7, 0xDD, 0x6F, 0x5B, 0x19, 0x30, 0x19,
        0xFB, 0xEF, 0xE, 0x37, 0xF0, 0xE, 0xCD, 0x16, 0x49, 0xFE, 0x53, 0x47, 0x13, 0x1A, 0xBD, 0xA4, 0xF1,
        0x40, 0x19, 0x60, 0xE, 0xED, 0x68, 9, 6, 0x5F, 0x4D, 0xCF, 0x3D, 0x1A, 0xFE, 0x20, 0x77, 0xE4, 0xD9,
        0xDA, 0xF9, 0xA4, 0x2B, 0x76, 0x1C, 0x71, 0xDB, 0, 0xBC, 0xFD, 0xC, 0x6C, 0xA5, 0x47, 0xF7, 0xF6, 0,
        0x79, 0x4A, 0x11];
      return maps[(i * i + 80923) % 256];
    }
  </script>
</body>

</html>
